Codegen parameter for query json serialization #966

Job	Run time
Build Java Client JDK8 (samples/client/echo_api/java/feign-gson)	59s
Build Java Client JDK8 (samples/client/echo_api/java/apache-httpclient)	1m 18s
Build Java Client JDK8 (samples/client/echo_api/java/resttemplate)	1m 10s
Build Java Client JDK8 (samples/client/echo_api/java/okhttp-gson)	1m 10s
Build Java Client JDK8 (samples/client/echo_api/java/resteasy)	50s
	5m 27s

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